C fiber toughening Al2O3-ZrO2 eutectic via ultrasonic-assisted directed laser deposition

Carbon fiber (C fiber) toughening nanoscale Al2O3-ZrO2 eutectic was prepared by ultrasonic-assisted directed laser deposition (DLD). The eutectic spacing detected by TEM was 50 ± 5 nm, which was 5-30% of the Al2O3-ZrO2 eutectic. The reasons for the decrease of eutectic spacing were analyzed from two aspects: ultrasonic-assisted and C fiber addition. The fracture toughness was 8.7 ± 0.2 MPa m1/2 measured by indentation crack length, which was about 2.5 times higher than Al2O3-ZrO2 eutectic.